Experimental Research on Fire Damage of Tunnel Lining Concrete Test Blocks

机译：隧道衬砌混凝土试块火灾破坏的试验研究

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In tunnel fire, lining concrete can be damaged to different degrees according to the water content of concrete and the temperatures it is subjected to. Three groups of C25 concrete standard test blocks with different water content were heated for 5 hours at different constant temperature respectively and put aside after being cooled. Then compressive tests and splitting tensile tests were carried out to investigate the influence of water content and temperature on the residual strength of the concrete test blocks. The results show that, Water content is the main factor causing bursting of concretes at high temperature. When temperature is below 200°C, higher water content is prevail to enhancing the residual compressive strength of concrete. After high temperature, the splitting tensile residual strength of concrete loses much quicker than the compressive residual strength, and that higher water content would aggravate the reduction of its tensile performance.

机译：在隧道火灾中，衬砌混凝土会根据混凝土的含水量和所承受的温度而受到不同程度的破坏。将三组不同含水量的C25混凝土标准试块分别在不同的恒温下加热5小时，冷却后置于一旁。然后进行压缩试验和劈裂拉伸试验，以研究含水量和温度对混凝土试块残余强度的影响。结果表明，含水量是引起高温下混凝土爆裂的主要因素。当温度低于200°C时，较高的水含量占主导地位，以提高混凝土的残余抗压强度。高温后，混凝土的劈裂抗拉残余强度比抗压残余强度损失快得多，而且较高的水含量会加剧其抗拉性能的降低。

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《International symposium on progress in safety science and technology;2010 ISSST》|2010年|p.690-696|共7页
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作者
XU Zhisheng; XIE Baochao; DUAN Xiongwei; WU Dexing; LI Weiping;
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中图分类安全科学;安全科学;
关键词
lining concrete; water content; high temperature; residual strength; burst;

机译：衬砌混凝土;含水量;高温;残余强度;爆裂;

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7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。

Experimental Research on Fire Damage of Tunnel Lining Concrete Test Blocks

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